刘俊龙1,2,耿国芳1,2,庞斌1,2,冯新刚1,2
1.内燃机可靠性国家重点实验室，山东 潍坊 261061；2.潍柴动力股份有限公司，山东 潍坊 261061
摘要：为了提高直列8缸机的排气能量利用率，利用AVL-Boost软件建立某直列8缸柴油机匹配2台增压器的计算模型，分析3种排气管布置方案下的各缸排气流量、涡轮增压器效率、各缸均匀性、发动机性能等参数。分析结果表明：布置方案A的整体性能较好、各缸排气干扰和回流小、废气能量利用率高，但各缸均匀性略差；与方案B、C相比，方案A的整机油耗率降低5~8 g/(kW·h)，涡轮增压器效率提高4%~6%，泵气损失减小60~100 kPa，充气效率提高3%~4%。
关键词：双增压发动机；排气管；性能；仿真计算
Abstract:In order to use more exhaust energy，AVL-Boost is used to establish a calculation model of an inline 8cylinder diesel engine with dual turbochargers, and the simulation is done with three different exhaust pipe layouts,the parameters such as exhaust flow of each cylinder, turbocharger efficiency, uniformity of each cylinder and engine performance under three kinds of exhaust pipe layout schemes are analyzed. The analysis results show that overall performance of layout A is better, the exhaust interference and backflow of each cylinder is smaller, the exhaust energy utilization rate is higher, but the uniformity of each cylinder is slightly worse.Compared with layout B and C, the fuel consumption rate of the whole machine in layout A is 5~8 g/(kW·h) lower, the turbocharger efficiency is 4%~6% higher, the pump gas loss is 60~100 kPa lower, and the gas charging efficiency is 3%~4% higher.
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